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. 1990 Nov;64(11):5510–5518. doi: 10.1128/jvi.64.11.5510-5518.1990

Transcription factors NFI and NFIII/oct-1 function independently, employing different mechanisms to enhance adenovirus DNA replication.

Y M Mul 1, C P Verrijzer 1, P C van der Vliet 1
PMCID: PMC248603  PMID: 2214023

Abstract

Initiation of adenovirus DNA replication is strongly enhanced by two transcription factors, nuclear factor I (NFI) and nuclear factor III (NFIII/oct-1). These proteins bind to two closely spaced recognition sequences in the origin. We produced NFI and NFIII/oct-1, as well as their biologically active, replication-competent DNA-binding domains (NFI-BD and the POU domain), in a vaccinia virus expression system and purified these polypeptides to apparent homogeneity. By DNase I footprinting and gel retardation, we show that the two proteins, as well as their purified DNA-binding domains, bind independently and without cooperative effects to their recognition sequences. By using a reconstituted system consisting of the purified viral proteins (precursor terminal protein-DNA polymerase complex (pTP-pol) and DNA-binding protein, we show that NFIII/oct-1 or the POU domain stimulates DNA replication in the absence of NFI or NFI-BD and vice versa. When added together, the enhancing effect of the two transcription factors was independent and nonsynergistic. Interestingly, stimulation by NFI or NFI-BD was strongly dependent on the concentration of the pTP-pol complex. At low pTP-pol concentrations, NFI or NFI-BD stimulated up to 50-fold, while at high concentrations, the stimulation was less than twofold, indicating that the need for NFI can be overcome by high pTP-pol concentrations. In contrast, stimulation by NFIII/oct-1 or the POU domain was much less dependent on the pTP-pol concentration. These data support a model in which NFI enhances initiation through an interaction with pTP-pol. Glutaraldehyde cross-linking experiments indicate contacts between pTP-pol and NFI but not NFIII/oct-1. The site of interaction is located in the NFI-BD domain.

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